Transitional user interface for a portion of a display screen



FIG. 1 is a front view of the first image of a transitional user interface for a portion of a display screen showing our new design;

FIG. 2 is a front view of the second image thereof; and,

FIG. 3 is a front view of the third image thereof.

The appearance of the image transitions sequentially between the images shown in FIGS. 1–3. The process or period in which the first image transitions to the others forms no part of the claimed design. The broken line drawing showing of the remainder of a display screen is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a transitional user interface for a portion of a display screen, as shown and described. 